I'd be happy to elaborate on it. This is still going to be all theory, because I haven't thought of a concrete example.
Let's just say we are in a Decision driver.
I decide to run for President of some club at my graduate school. This leads to the actions of campaigning, etc. and then the Second Driver is a bunch of people deliberating whether or not they think I'll be a good President. Some say yes, some say no, and this leads to a bunch of actions (like interrupting classes to promote me and hanging big signs on buildings to embarrass me).
Then the campaign manager for Obama decides to help me.
This will obviously shift the perspective of the story, as Drivers are supposed to do. But it comes out of nowhere. It would be extremely jarring--assuming (like I am) that the story is small and contained to the university. How would this guy even know?? Why would he want to help me??
More specific to my point, it's not the effect of any cause, nor is it the world trying to rebalance. It just kind of happens, unrelated to anything else.
I am probably opening a can of worms here, but I have an example from Stranger Things 3 that feels tacked on that really pulled me out of the story and I would guess that they would have a tenuous tie to the three-pronged storyform of that season of the show. I'm going to resist putting it here, under my "everything deserves a month before spoilers are allowed" policy.
Also, he's a ghost. He's been dead the whole time.